Linux 获取网卡信息

#include <sys/ioctl.h>
#include <net/if.h>
#include <unistd.h>
#include <netinet/in.h>
#include <string.h>

int main()
{
struct ifreq ifr;
struct ifconf ifc;
char buf[2048];
int success = 0;

int sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
if (sock == -1) {
printf("socket error\n");
return -1;
}

ifc.ifc_len = sizeof(buf);
ifc.ifc_buf = buf;
if (ioctl(sock, SIOCGIFCONF, &ifc) == -1) {
printf("ioctl error\n");
return -1;
}

struct ifreq* it = ifc.ifc_req;
const struct ifreq* const end = it + (ifc.ifc_len / sizeof(struct ifreq));
char szMac[64];
int count = 0;
for (; it != end; ++it) {
strcpy(ifr.ifr_name, it->ifr_name);
if (ioctl(sock, SIOCGIFFLAGS, &ifr) == 0) {
if (! (ifr.ifr_flags & IFF_LOOPBACK)) { // don't count loopback
if (ioctl(sock, SIOCGIFHWADDR, &ifr) == 0) {
count ++ ;
unsigned char * ptr ;
ptr = (unsigned char  *)&ifr.ifr_ifru.ifru_hwaddr.sa_data[0];
snprintf(szMac,64,"%02X:%02X:%02X:%02X:%02X:%02X",*ptr,*(ptr+1),*(ptr+2),*(ptr+3),*(ptr+4),*(ptr+5));
printf("%d,Interface name : %s , Mac address : %s \n",count,ifr.ifr_name,szMac);
}
}
}else{
printf("get mac info error\n");
return -1;
}
}
}